Limited access lock

Details Limited access lock Limited access lock

1976-08-11

1978-01-17

Wolfe, Robert L.

Locks

Operating mechanism

Predetermined time interval controlled

70337, 70364A, E05B 2704, E05B 4300

Patent

active

040685071

ABSTRACT:
A lock has a lock cylinder provided with a rotatable core which is normally prevented from rotating by drivers that bridge the shear line between the core and the main body of the cylinder. However, when either first or second keys are inserted into the core, pins within the core are elevated to the shear line so that the drivers no longer prevent rotation of the core. The main body of the cylinder also contains a push rod which is urged into the core by an actuator when the actuator is energized, but is otherwise located out of the core with its inner end flush with the shear line. The core also contains a pin which aligns with the push rod. The first key is incapable of moving the push rod out of the core so that the core may be turned with the first key only when the actuator is de-energized. The second key, however, forces the pin associated with the push rod against the push rod and moves the push rod outwardly to the shear line, even when the actuator is energized. Thus, the second key will rotate the core irrespective of whether or not the actuator is energized.

REFERENCES:
patent: 3670538 (1972-06-01), Curry

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